You receive an “RPC is not configured properly” error message when you are using an Exchange Server e-mail account and you start Outlook 2007 or Outlook 2003

When you try to start Microsoft Office Outlook 2007 or Microsoft Office Outlook 2003, and you have your e-mail account setup for a Microsoft Exchange Server, you may receive the following error message:

A system component, RPC, required by Outlook to connect to the e-mail server is not configured properly. For more information, contact your system administrator.


This behavior may occur when any of the following registry values are missing in the Microsoft Windows Registry.

Value Name Value Data
ncacn_np Rpcrt4.dll
ncacn_ip_tcp Rpcrt4.dll
ncadg_ip_udp Rpcrt4.dll
ncacn_http Rpcrt4.dll


To resolve this problem, follow these steps:

1. Quit all Microsoft Windows programs.
2. Click Start, and then click Run.
3. In the Open box, type regedit, and then click OK.
4. Expand the Registry to the following key:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\ClientProtocols
5. If any of the Registry values that are listed in the “Cause” section of this article are missing from the ClientProtocols key, follow these steps:

a. Right-click ClientProtocols, point to New, and then click String Value.
b. Type the Value Name of the entry that is missing, and then press ENTER.
c. Right-click the Value Name that you typed in step b, and then click Modify.
d. Type the appropriate Value Data for the Value Name that you typed in step b, and then click OK.
6. Repeat step 5 for each missing value in the ClientProtocols key.

Note Microsoft Outlook cannot connect to a Microsoft Exchange server if the registry entries that were previously mentioned are missing in the Windows Registry.


Microsoft Knowledge Base Article

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